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United States Patent | 5,565,846 |
Geiszler ,   et al. | October 15, 1996 |
A reader for radio frequency identification tags having at least one magnetic field transmitting and receiving coil which is oriented in a given plane and which is responsive to a received magnetic exciter field of a first frequency to produce and radiate an identifying magnetic field comprised of a carrier at a second different frequency modulated by an identifying code. The reader comprises a first circuit for producing a radio frequency signal of the first frequency; a first magnetic field coupling arrangement connected to the output of said first circuit for producing a corresponding exciter field at the first frequency to be magnetically coupled to the receiving coil of the tag, with the first magnetic field coupling arrangement including a solenoidal exciter coil having at least one wound exciter winding and a longitudinal axis disposed substantially perpendicular to the plane of the tag coil; a second magnetic field coupling arrangement for receiving a magnetic field of the second frequency produced by the tag and providing a corresponding electrical signal, with the second magnetic field coupling arrangement including at least one receiver coil disposed adjacent one end of the solenoidal coil; and circuitry connected to the receiver coil for decoding the received electrical signal. Preferably the tag is disposed on the lid of a trash or waste bin with the tag coil being substantially horizontal and the axis of the exciter coil is disposed substantially vertically.
Inventors: | Geiszler; Theodore D. (Los Gatos, CA); Eberhardt; Noel H. (Cupertino, CA); Walker; Russel E. (San Jose, CA); Radding; Herbert P. (Saratoga, CA) |
Assignee: | Indala Corporation (San Jose, CA) |
Appl. No.: | 312199 |
Filed: | September 26, 1994 |
Current U.S. Class: | 340/572.2; 177/139; 177/145; 340/5.61; 340/5.66; 340/10.1; 340/551; 340/572.4; 340/572.7 |
Intern'l Class: | G08G 013/14 |
Field of Search: | 340/572,551,825.34,825.3 177/139,145 |
5012236 | Apr., 1991 | Troyk et al. | 340/572. |
5099226 | Apr., 1992 | Andrews | 340/572. |
5099227 | Mar., 1992 | Geiszler et al. | 340/572. |
5221831 | Aug., 1993 | Geiszler | 340/572. |
5230393 | Jul., 1993 | Mezey | 177/139. |